Try to always dtrt if routerlist==NULL

svn:r2489

src/or/circuitbuild.c

@@ -989,6 +989,8 @@ onion_new_cpath_build_state(uint8_t purpose, const char *exit_digest)
   cpath_build_state_t *info;
   routerinfo_t *exit;
   router_get_routerlist(&rl);
+  if (!rl)
+    return NULL;
   r = new_route_len(options.PathlenCoinWeight, purpose, rl->routers);
   if (r < 1) /* must be at least 1 */
     return NULL;

src/or/directory.c

@@ -554,6 +554,7 @@ connection_dir_client_reached_eof(connection_t *conn)
       return -1;
     }
     router_get_routerlist(&rl);
+    if (rl)
       routerlist_update_from_runningrouters(rl,rrs);
     running_routers_free(rrs);
   }

src/or/router.c

@@ -386,6 +386,7 @@ void router_retry_connections(void) {
   tor_assert(server_mode());
 
   router_get_routerlist(&rl);
+  if (!rl) return;
   for (i=0;i < smartlist_len(rl->routers);i++) {
     router = smartlist_get(rl->routers, i);
     if(router_is_me(router))

src/or/routerlist.c

@@ -448,7 +448,8 @@ routerinfo_t *router_get_by_addr_port(uint32_t addr, uint16_t port) {
   int i;
   routerinfo_t *router;
 
-  tor_assert(routerlist);
+  if (!routerlist)
+    return NULL;
 
   for(i=0;i<smartlist_len(routerlist->routers);i++) {
     router = smartlist_get(routerlist->routers, i);
@@ -653,6 +654,7 @@ int router_add_to_routerlist(routerinfo_t *router) {
   routerinfo_t *r;
   char id_digest[DIGEST_LEN];
 
+  tor_assert(routerlist);
   crypto_pk_get_digest(router->identity_pkey, id_digest);
 
   /* If we have a router with this name, and the identity key is the same,
@@ -989,6 +991,7 @@ int router_compare_addr_to_exit_policy(uint32_t addr, uint16_t port,
 int router_exit_policy_all_routers_reject(uint32_t addr, uint16_t port) {
   int i;
   routerinfo_t *router;
+  if (!routerlist) return 1;
 
   for (i=0;i<smartlist_len(routerlist->routers);i++) {
     router = smartlist_get(routerlist->routers, i);